///*
// * Copyright 2019 The gRPC Authors
// *
// * Licensed under the Apache License, Version 2.0 (the "License");
// * you may not use this file except in compliance with the License.
// * You may obtain a copy of the License at
// *
// *     http://www.apache.org/licenses/LICENSE-2.0
// *
// * Unless required by applicable law or agreed to in writing, software
// * distributed under the License is distributed on an "AS IS" BASIS,
// * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// * See the License for the specific language governing permissions and
// * limitations under the License.
// */
//
//package com.gonsin.ta.logic.proto;
//
//import io.grpc.CallCredentials;
//import io.grpc.Metadata;
//import io.grpc.Status;
//import io.jsonwebtoken.Jwts;
//import io.jsonwebtoken.SignatureAlgorithm;
//
//import java.util.concurrent.Executor;
//
///**
// * CallCredentials implementation, which carries the JWT value that will be propagated to the
// * server in the request metadata with the "Authorization" key and the "Bearer" prefix.
// */
//public class JwtCredential extends CallCredentials {
//
//  private final String subject;
//
//  public JwtCredential(String subject) {
//    this.subject = subject;
//  }
//
//  @Override
//  public void applyRequestMetadata(final RequestInfo requestInfo, final Executor executor,
//      final MetadataApplier metadataApplier) {
//    // Make a JWT compact serialized string.
//    // This example omits setting the expiration, but a real application should do it.
//    final String jwt =
//        Jwts.builder()
//            .setSubject(subject)
//            .signWith(SignatureAlgorithm.HS256, Constant.JWT_SIGNING_KEY)
//            .compact();
//
//    executor.execute(new Runnable() {
//      @Override
//      public void run() {
//        try {
//          Metadata headers = new Metadata();
//          headers.put(Constant.AUTHORIZATION_METADATA_KEY,
//              String.format("%s %s", Constant.BEARER_TYPE, jwt));
//          metadataApplier.apply(headers);
//        } catch (Throwable e) {
//          metadataApplier.fail(Status.UNAUTHENTICATED.withCause(e));
//        }
//      }
//    });
//  }
//
//  @Override
//  public void thisUsesUnstableApi() {
//    // noop
//  }
//}
